kill -CONT -1
deve enviar o sinal para todos os processos que você tem permissão para enviar sinais para (com algumas exceções):
If the user has super-user privileges, the signal is sent to all processes excluding system processes (with P_SYSTEM flag set), process with ID 1 (usually init(8)), and the process sending the signal. If the user is not the super user, the signal is sent to all processes with the same uid as the user excluding the process sending the signal. No error is returned if any process could be signaled.
— from kill(2)